Just what is in Bristol’s water supply? Or is it simply a combination of estuary location, compact size and integrated population? But just as there is a dialect called Bristolian, there is an identifiably Bristolian sound – restlessly rhythmic, marvellously moody, acutely melodic, something urban and yet oceanic, full of hidden depths and currents.

"I don’t know what’s in the water here,” wonders one half of Malachai, the singularly named Scott, “but for me it’s down to B Boy principles, and...